Annealing furnace



mi Rodel.) 42 sheets-sheet 1.

B. J.. ABBDTT. ANNEALING FURNAGB.

No. 593;557. Patented Nov. 16, 1897.

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(No Model.) 2 sheets-sheet 2 B.J. ABBOTT. ANNEALING FURNAGE.

"N5 593,555 PatentedvNov. 15, 1597-:

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PATENT BENJAMIN JUDD ABBOTT, or O'IIIcAcO, ILLINOIS, AssIcNoB To cI-IABLns II: DUBPIIY, or sAMB PLAcE.

ANNEALlNe-FURNAOE.

SPECIFICATION forming part of Letters Patent No. 593,557, dated November 16, 1897.

' Appnanon nea Aprn 5,1897. sesamo. 630,700. (remodel.)

To aZZ whom it may concern:

Be it known that I, BENJAMIN JUDD ABBOTT, a citizenfof the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvelnent in Annealing-Furnaces, of which the following is a specication.

My invention relates. to improvements in annealing-furnaces. f

The object of my invention is to provide a furnace or apparatus of a simple, durable, and efficient construction by which metal articles may be rapidly and cheaply annealed, whileat the same time a regular and uniform annealing action is imparted to each and everyarticle and a uniform product thus turned out.

My invention consists, essentially, in the combination, with a heating-furnace, of an inclined rotating annealing chamber or cylinder through which the articles to be annealed lconveyed back to the annealing chamber or are conveyed or pass in' connection with hot sand, with which the articles to be annealed come in contact 'as they pass through the cylinder-in at one end and out at the other. also consists, in connection with these parts, in an elevator or conveyer for returning the sand over and over again to the rotating annealing chamber or cylinder, in a screen for separating the sand from the annealed articles, and in a supplemental rotating chamber or cylinder for reheating the sand as it is cylinder, so that the sand may be kept of a comparatively uniform temperature while acting upon the articles to be annealed.

My invention, further consists in the novel construction of parts and devices and in the novel combinations of parts and devices herein shown and described, and specified in the claims.

In the accompanying drawings, which form a part'of this specification, Figure l is a vertical longitudinal section of an annealing furnace or apparatus embodying my invent-ion. Fig. 2 is a cross-section on the line 2 2 of Fig. 1.v Fig. 3 is a detail plan view of the screen and discharge-chute for separating the sand from the annealed articles. Fig. 4 is a detail end view showing one of theadjustable bearings for the shaft of the rotating chamber or cylinder.

In the drawings, A represents the fire-box of a furnace, A its heating-chamber, and A2 its smoke flue or stack.

The furnace may be of any suitable kind or construction and designed for burning any suitable kind of fuel. In the drawingsI have illustrated it as being furnished with a grate A3 for burning coal. i

B is an inclined `rotating annealing-chamber, preferably of cylindrical form, extending longitudinally across the 4heating-chamber of the furnace, through which the hot sand C and the articles to be annealed are conveyed or pass, and B/ is the similar rotating cylinder or chamber for reheating the sand as it is returned to the rotating annealing chamber or cylinder B.

The cylinder B is Open at both ends for admission and discharge, of the sand and articles to be annealed, and it is provided with short or stub shafts b, secured thereto'by winged heads or spiders h', which fit inside the cylinder and are bolted or riveted thereto. The shafts b h are journaled in adjustable boxes h2 h2, fixed. to the framework E by adjusting-screws b3 b3. plemental cylinder is likewise open at both ends for admission and discharge of the sand and has similar short shafts or gudgeons h, spiders b', journalboxes h2, and adjustingscrews b3. h of the cylinder B is mounted in an adjustable collar or plate b4, fixed to the frame E by adjusting-screws h3.

D is an elevator or conveyer for lifting the hot sand from the boot or pit D', into which it is discharged from the cylinder B, and delivering it into the upper end of the rotating cylinder B', through the chute or spout D2, with which the elevator is provided .for this purpose.

The elevator or conveyer D may be of any suitable kind or construction,but preferably consists of a chain d, running over pulleys furnished with buckets d2 and inclosed in a case cl3.

F is a screen by which the articles annealed are separated from the sand as the same are delivered together from the annealing-cylinder B, and F a chute for delivering the annealed articles into the car G or other convenient receptacle.

The upper or-sup- The j ournal-boX at the lower end IOO ceiving platform or hopper H2,onto which theyQ may be dumped from the car or cen'vey'erlrl1 The annealing-cylinder B and the sand-reheating cylinder B are both continuonslyro-g tated by any suitable gearing or mechanism. As illustrated in the drawin gs,M is the dri ving-shafdfurnishedwith a driving-pulley M" The driving-shaft M is' providedwith agear niwhichmeshes With a gear (inthe-"upper .pulley-'shaft d4' of the elevator D.

To receive the end thrust of -`theV inclined rtating'cylinders B B,'the shaft-b at the "lower end of each is'provided'vvith a hardened-y,`

steel bearing toe b6,'which bears against the bearing-disks blibl'in the jeurnalLboXes'b2 of 'said shafts.

I nY -operation the attend-ant standingint'he` nealed `-along the 1 delivery-chu'tefHfinto the:

rotating inclined annealing 1vchamber or cyle inder B,Which is partially filled'withhn'tsand EGand intowhichithe reheate'dsand is beingAv 'constantly 'delivered or returned from fthe' cylinderB. Owing to -the inclina-tionfand retation ofthe cylinderB, the sand andfar'ti- {cles'to be annealed are slowly fed or conveyed through the lsai'nefrom one endto the other, j

and 'as theV articles are thu-s'conveyed through the 'annealing-chamber they are 'heated to a` uniform degree by reasoncf'the hetsantiand` thetumbling;stirring, or mixingt action pro# duced bythe frotation ofthe cylinder andthe u n ifor-m' tim e@ required for passing'the articles j through the cylinder. A's thesand and heated articlesare disehfarged'from Vthe tlower end of fthe cylinder B the samepass 'ontos the screen F,Whi ch separates the' sand from the articles,v

the articles passing along'the chute F to the car'Gand-the sand droppin'ginto the '-pito'r The elevator or conduet'o'rD then returns thelsa'ndto the rotating inclined sandreheating cylinder lB',

back to the receiving end of the cylinderfB,

intowhi'chi-t is delivered by thespout or chute H.

The'lo'peration is thus 4eentin-neus:and Vautomaticand'uniform upon eaeh and every article.

AS illustrated in Fig. 2 the wan ofthe-furnace projects outer approaches close 5to the cylinder B at a and closeto the cylinderBat 'a,so'a's to properly deiiect the flame er heated products' of lcombustion around and 'against l`the:cylinders and heat the same.

sider to bethepreferableconstruction of the furnace.

I claimv l. In an annealing apparatus, the combination with a furnace of an inclined rotating annealing chamber or cylinder for passing or conveying sand and the articles to be annealed through or across the furnace, and "means for returning the sand again and again to said rotating annealing chamber or cylinder, substantially as specified.

f2. Injan annealing apparatus, the combination vWith a vfurnace of an inclined rotating annealing chamber or cylinder for passing or conveying sand and the articles to be annealed through or across the furnace, means Afor returning thes'and again and again to said `rotating annealing chamber or cylinder, and means for reheating the sand as lit is being returned to said annealing chamber or cylinder, substantially as specified.

3. In an annealing apparatus, the lcombination with a furnace of aninclined rotating annealing chamber or cylinder,` an opposite] yinclinedrotating sand-reheating chamber or cylinder, a screen for separating the sand from'the articles being annealed, and an cleva'tcr or conveyer for delivering the sand into said reheating chamber or cylinder,'substan Vtally'as specified.

4. In an annealingapparatus,the combination with a furnace of an inclined rct'ating annealing chamber or'cylinder; an oppositelyinclined rotating sand-'rehcating 'chamber or cylinder, va I'screen fer separating the "sand from 'the articles being annealed, an elevator -or conveyerfcr delivering the sand/into said reheatingchamber orl cylinder, and a'chute 'or spout'for returning the'sand'from'said re- Eheating' chamber or cylinder to 'saidannealing chamber or cylinder, substantially 'as speciiied. y

5. Inla'nannealing apparatus, the combi- -nationwvith'affurnace of an'inclined rotating annealing chamber or cylinder, an oppositely- 'inclined rotatingsand-rehe'atingchamber or r`cylinder, -a screen for separatin .,r thesand ffromithe articles being annealed, an elevator orconveyer'for delivering the sand into'said 'rehea'ting 'chamber er cylinder,'fa chute or spout for returning the sand from 'said re- `heating chamber or cylinder'to said anneal- `ingchamber orcylinder, a discharge-chiite for the annealed articles 'and a delivery-chute forfthe same,l s-ubstantially'as specified. l

6. In an annealing apparatus, the combination withf a furnace of 1 a rotating f anneal- -ing-chamber l extending across ith'e iheatin g- =cha1nber cf the furnace, andfmeans for lcausing-sand to be'repeatedly returned to and passed through said chamber-With the articles tof'be annealed, substantially as' speciiied.

BENJAMIN'JUDD ABBOTT. Witnesses H. dvi. -MUNDL/w,

1L. E. kCURTIS.

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